单项选择题

() of the land in that district () covered with trees and grass.

A．Two fifth; is
B．Two fifth; are
C．Two fifths; is
D．Two fifths; are

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单项选择题
It is essential that these application()forms back as early as possible.

A．must be sent
B．will be sent
C．are sent
D．be sent
单项选择题
Someone is knocking at the door. It () my mother. It's time for her to be back.

A．can he
B．may not he
C．must be
D．mustn't be
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